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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6d63cfae0345e0dd9715a7502cb2c543030ba9a1bae1c23cbdb8d418726ae2f' 
  AND token = '0wJMJNcdJV1ZnHZ37YU48XiMbIV9D+9J7u2tW1BT6/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}